Drill-coupling.



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No. 67|,8o3.

(No Model.)

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UNITED 'STATES PATENT OFFICE.

JOHN A. .MARTIN, OF CALAIS, OHIO.

DRILL-COUPLING.

. SPECIFICATION forming'part of Letters Patent No. 671,803, dated April9, 1901.

Application filed January 17, 1901. Serial No. l13,676. (NO model.)

To a/ZZ whom, it may con/ecru.-

Be it known that I, JOHN A. MARTIN, a citizen of the United States,residing at Calais, in the county of Monroe, State of Ohio, haveinvented certain new and useful Improvements in Drill-Couplings; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to drill-couplings; and it has' for its object toprovide a coupling between the drill-shaft and the stem of the drillwhich will prevent accidental disengagement of the parts, so that thedrill may not be left in the well when the drill-shaft is withdrawntherefrom. Further objects and advantages of the invention will beevident from the following description.

In the drawings forming a portion of this specification, and in whichlike nuinerals of reference indicate similar parts in the several views,Figure lis a longitudinal section of the lower portion of a drill-shafthaving the stem of a drill engaged therewith and held againstdisplaceinent by means of the key, all in accordance with the presentinvention. Fig. 2 is a detail perspective view showing the springkey.showing the upper end of the drill-stem and the transverse groovestherein. Fig. 4: is a perspective view showing a wedge made of rubber.

Referring nowto the drawings, 5 represents a portion of a drill-shaft,such as commonly used in boring wells, and in the lower end of which isformed a longitudinally-extending recess 6, and opening through the sideof the shaft and into the recess thereof is a slot 7, the inner endthereof being reduced in height, so that the outer end thereof is in theform of a countersin k.

The drill is shown at 8 and has an axiallyextending stem 9, which isadapted to slidingly fit the recess in the lower'end of the shaft, andin the upper end of this stem` there are formed a number of transverseslots 10, ly-

ving diametrically of the stem. The stem is threaded, as shown, forengagement with the threads of the recess or socket 6. When the stem ofthe drill is engaged with the recess or socket, the slots of the endthereof are Fig. 3 is a perspective view' adapted to interchangeablyaline with the opening or slot 7 to receive a key, which Will act toprevent rotation of the stem and consequent displacement of the drillfrom the shaft. The key that is used consists of a spring-plate bentupon itself to .form two diverging arms 11 and 12,which are bentsharplyinwardly to form Shoulders 13 and 14E and are then continued rearwardly.The slot 7 is formed below the inner end of the recess 6, and thespring-key, when inserted with its doubled end through the slot 7 andinto an alining slot 10, is compressed and then allowed to expand toengage its Shoulders 13 and 14 against the inner wall of the recess 6,above and below the slot 7, to prevent withdrawal of the key.

To prevent movement of the arms of the key toward each other, which isnecessary in order to withdraw the key from operati ve po,- sition, theinner facesof the arms are threaded, as shown, for engagement of ascrewwedge 15, which when screwed inwardly acts to separate the arms andhold them in separated position. The ends of the key project into theenlarged outer end of the slot 7 and permit of engagement of tongstherewith to compress them after the wedge is'withdrawn to permit ofremoval of the key.

In Fig. 4 is shown a different form of wedge made of rubber, which notonly acts to hold 'the arms of the key apart, but plugs up the slot 7 insuch manner as to prevent ingress of water.

It will of course be understood that in practice various othermodifications of the invention may be made and that any suitablematerials and proportions may be used for the various parts withoutdeparting from the spirit of the invention.

What is claimed is-- 1. The combination with a drill-shaft having aterminal socket and a lateral slot opening into the socket at a pointbelow its inner end, of a drill having a stem provided with slotsadapted for interchangeable alinement with the slot of the shaft, saidstem and shaft being also adapted for threaded engagement, and a keycomprising diverging spring members adapted for engagement with thealining slots, said members having Shoulders for engagement againstShoulders on the wall of IOO the socket of the shaft under the influenoeof the spring quality of the members, to prevent withdrawal of the key.

2. The combination with a drill-sh-aft having a terminal socket and alateral slot opening into the soeket below the inner end thereof, of adrill having a stem provided with terminal transverse slots adapted forinterehangeable alinement With the slot of the shaft, said stem andshaft being adapted also for threaded engagement, and a key oomprisingdiverging spring members bent inwardly between their ends to formShoulders, said members in the rear of the shoulders being threaded on,their adjaeent faoes, the key being adapted to enter adlining slots andto expand to engage its Shoulders against the wall of the reeess, and ascrew-plug for engagement with the threads of'the key members to preventcompression of the key, whereby the key will be held against aeoidentaldisplaoement.

3.' The combination with a drill-shaft having a terminal socket and alateral slot opening into the socket 'at a point below its inner end, ofa. drill having a stem .provided with slots adapted for interohangeablealinement With the slot of the shaft, saidst-em andwshaft being alsoadapted for threaded engagement, and a keyioomprising diverging springmembers adapted for engagement With the alining slots, said membershaving shoulders for engagement against the Shoulders of the wall of thesocket of the shaft under the infiuenoe of the spring quality of themembers, to pre- Vent Withdrawal of the key and a plug adapted to liebetween the members of the key to prevent compression thereof.

In testimony whereof I hereunto sign my name, in the presenoe of twosubseribing witnesses, o'n the 23d day of November, 1900.

JOHN A. MARTIN.

Witnesses:

C. F. WEHR, E. S. STEPHEN.

